Refenes demoed the controller by playing his own game, Super Meat Boy, as well as Mossmouth’s Spelunky. According to TL;DR version of Refenes’ post—who is, by his claim, “very picky about controls in games”—the Steam Controller is off to a “great start” but “needs some improvements.”
“If you were to ask me if I would play games with the Steam Controller…I would say yes,” Refenes wrote. “If you were to ask me to choose between Steam Controller and a 360 controller, I would choose 360. Don’t take that as slight to the controller though because it’s more about the comfort of familiarity over functionality. I would choose a 360 controller because I have several thousand hours experience using it, however if tomorrow all game controllers were wiped off the earth and the only option was the Steam Controller I don’t think this would be a bad thing.”
Most of the immediately problems Refenes faced, including over-sensitivity int he touchpads, which resulted in Meat Boy moving when he was only resting his thumbs on the pad, were remedied after an on-hand engineer updated the firmware immediately.
Check out Refenes’ full post for a very detailed account of his hands-on experience with the Steam Controller prototype.